Green preparation method of light-weight low-thermal-conductivity gamma-Y2Si2O7 porous ceramic
A porous ceramic, low thermal conductivity technology, applied in ceramic products, applications, household appliances, etc., can solve problems such as unfavorable green industrial production, little research on porous ceramics, etc., to achieve easy mass production, fewer types of raw materials, and preparation methods simple effect
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[0025] Example 1
[0026] First weigh 50g deionized water, add 1g citric acid and Y under constant stirring 2 O 3 :SiO 2 100g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 1-2μm, and then stirred for 3 hours to form a slurry;
[0027] Then put the slurry in a water bath at 45°C, add 1.5g of sodium lauryl sulfate, stir quickly (the mixer speed is 1700rpm) for foaming for 20 minutes, then add 3.5g of gelatin and 3g of glycerol, and stir for 5 minutes Post-injection molding, forming a blank after demolding;
[0028] The green body was dried at room temperature for 20 hours, and then dried in an oven at 75°C for 25 hours. Finally, high-temperature reaction sintering was carried out at 1525°C in air. The heating rate of high-temperature reaction sintering was 5°C / min, and the holding time was 1.5 hours. Burn off organic compounds and synthesize γ-Y with light weight, high porosity and low thermal conductivity through a green ...
Example Embodiment
[0029] Example 2
[0030] Weigh 40g deionized water first, add 0.5g ammonium citrate and Y under constant stirring 2 O 3 : SiO 2 80g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 2 ~ 3μm, and then stirred for 1.5 hours to form a slurry;
[0031] Then put the slurry in a water bath at 40°C, add 0.6g of sodium lauryl sulfate, stir quickly (the mixer speed is 1500rpm) for foaming for 10 minutes, then add 2.5g of gelatin and 2g of polyethylene glycol, and stir for 10 minutes. Injection moulding in minutes, forming a green body after demoulding;
[0032] The green body was dried at room temperature for 30 hours, and then dried in an oven at 65°C for 30 hours. Finally, high-temperature reaction sintering was carried out at 1500°C in the air. The heating rate of high-temperature reaction sintering was 7°C / min, and the holding time was 2 hours. Burn off organic compounds and prepare γ-Y with light weight, high porosity and low t...
Example Embodiment
[0033] Example 3
[0034] Weigh 60g deionized water first, add 1.5g ammonium citrate and Y under constant stirring 2 O 3 : SiO 2 120g of mixed powder with a molar ratio of 1:2, mixed, Y 2 O 3 And SiO 2 The particle size of the mixed powder is 0.5 ~ 1.5μm, and then stirred for 2 hours to form a slurry;
[0035] Then put the slurry in a 48°C water bath, add 2g of sodium lauryl sulfonate, stir quickly (the mixer speed is 2000rpm) for foaming for 25 minutes, then add 4g of gelatin and 5g of polyethylene glycol, and stir for 15 minutes Post-injection molding, forming a green body after demolding;
[0036] The green body was dried at room temperature for 25 hours, and then dried in an oven at 85°C for 20 hours. Finally, high-temperature reaction sintering was carried out at 1550°C in air. The heating rate of high-temperature reaction sintering was 2°C / min, and the holding time was 1 hour. Burn off organic compounds and prepare γ-Y with light weight, high porosity and low thermal conductiv...
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